US5027631A - Method and device for controlling the stroke of a press machine - Google Patents
Method and device for controlling the stroke of a press machine Download PDFInfo
- Publication number
- US5027631A US5027631A US07/279,038 US27903888A US5027631A US 5027631 A US5027631 A US 5027631A US 27903888 A US27903888 A US 27903888A US 5027631 A US5027631 A US 5027631A
- Authority
- US
- United States
- Prior art keywords
- punching
- workpiece
- stroke
- interval
- control pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/26—Programme control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/002—Drive of the tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/20—Applications of drives for reducing noise or wear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0076—Noise or vibration isolation means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
Definitions
- the present invention relates to a method and device for controlling the stroke of the ram of a press machine which moves in the vertical direction by means of a hydraulic cylinder, and, in particular, to a method and device for controlling the stroke of a press machine so that the operation of the press machine can be performed at high efficiency with low vibration and low noise.
- a punching operation carried out by a press machine depends on the material of the workpiece, the plate thickness, and the punching velocity, but a large amount of noise and vibration are created in any cases.
- This vibration and noise is produced by the friction between the stroke operating section and the plate material, and due to the deflection of the frame during the action of the stroke operating section.
- the greater the velocity of the stroke the greater the amount of vibration and noise.
- control level for noise and vibration are determined by region and time of day, depending on the environmental control standards. Accordingly, the use of a press machine with a stroke operating section is severely restricted by time of day and by region, and in regions where the control is very strict it is necessary to provide elaborate anti-noise and antivibration devices.
- the principle by which vibration and noise are generated in the punching process is very complicated, and the appropriate value for the punching speed can only be obtained by actual observations. Accordingly, the appropriate value for the punching speed has been determined conventionally from test punch operations for type of material being processed, plate thickness and shape, or for each unit action. Accordingly, in the conventional technology, considerable time and trouble is required to create the appropriate speed and the overall operating efficiency is lowered.
- one sheet of plate material contains a plurality of sections for drawing
- one sheet of plate material contains a mixture of sections for punching and sections for drawing
- An object of the present invention is to provide, with due consideration to the drawbacks of such conventional devices, a method and device for controlling a press machine which creates appropriate control pattern in which the high efficient processing is performed with low vibration and low noise and the operating efficiency can be increased.
- This invention is accomplished based on the knowledge that the amount of vibration and noise are in principles determined by the punching pressure.
- a further object of the present invention is to provide a method and device for controlling the stroke of a press machine in carrying out the forming processes such as the punching and drawing of a workpiece with little noise and vibration.
- FIG. 1 is an explanatory drawing showing a model of a press machine and its control device.
- FIG. 2 is an explanatory drawing of a control pattern.
- FIG. 3 is an explanatory drawing of a test for punching a plate.
- FIG. 4 is an explanatory drawing showing a data table.
- FIG. 5 is an explanatory drawing showing a second embodiment of a control device.
- FIG. 6(A) 6(B) are explanatory drawings of control patterns.
- a workpiece moving and positioning device 3 for moving and positioning a workpiece WP in the form of a plate, in both the X-axis and Y-axis directions.
- the workpiece moving and positioning device 3 can be of a commonly known construction so it is shown as a schematic drawing only and an explanation of the construction details is therefore omitted.
- a die 5 which carries out a process on the workpiece WP and a punch 7 which acts in conjunction with the die 5.
- a punch 7 which acts in conjunction with the die 5.
- a plurality of dies 5 and the punches 7 are provided on a lower turret and an upper turret.
- These dies 5 and the punches 7 are commonly known so that they are shown as a schematic drawing only. An explanation of the construction details is therefore omitted.
- a hydraulic cylinder 9 is provided to apply pressure to the punch 7.
- the hydraulic cylinder 9 is mounted on an upper frame (omitted from the drawing) of the punch press 1, and is of a structure such that, by means of the vertical activation (in the Z direction) of a piston 11 provided in its internal section, a ram 13 such as a piston rod is activated in the vertical direction and pressure is applied to the punch 7.
- a position detection device 15 is provided on the hydraulic cylinder 9 for detecting the vertical position of the ram 13.
- the position detection device 15 can be, for example, a pulse encoder which outputs a pulse signal PLS proportional to the velocity of movement of the ram 3.
- the pulse signal PLS output by the position detection device 15 is input to a position and velocity detection section 17.
- the position and velocity detection section 17, by counting the number of the pulse signals PLS, detects the vertical movement position of the ram 13 and, for example, by counting the number of pulse signals PLS per unit time, it detects the movement velocity corresponding to the vertical movement position of the ram 13.
- a servo valve 19 is connected to a vertical pressure chamber in the cylinder 9, through a plurality of oil circuits OL1 and OL2.
- the servo valve 19 controls the volume of hydraulic fluid discharged to a tank T from hydraulic pump 21 or the volume of hydraulic fluid supplied to the hydraulic cylinder 9 from a hydraulic pump 21.
- a solenoid valve SOL is activated in proportion to the magnitude of an imposed electrical current to control the volume of flow of the hydraulic fluid.
- a servo valve control section 23 is provided to control the servo valve 19.
- the position and velocity detection section 17 and a main control section 25 are connected to the servo valve control section 23.
- the displacement of the servo valve spool may be fed back to the servo valve control section 23.
- a control pattern creation section 27 is provided to create the control pattern set in the main control section 25.
- the position and velocity detection section 17 and a pressure sensor 29 which detects the pressure in the upper part of the hydraulic cylinder 9 are connected to the control pattern creation section 27.
- a data storage section 31 is also connected to the control pattern creation section 27.
- the control pattern creation section 27 creates the control pattern based on the position data Z input from the position and velocity detection section 17, the pressure data P input from the pressure sensor 29, and the data stored in the data storage section 31.
- the control pattern created in the control pattern creation section 27 is a control pattern, for example, of the type shown in FIG. 2.
- the control pattern is stipulated from a velocity V A of an approach interval, a velocity V B of a process interval, a velocity Vc of a strike interval, and a velocity V D of a return interval.
- the approach interval extends from a descent starting position Z 2 of the ram 13 to the position at which the punch comes extremely close to, or is on the point of contacting the top surface of the workpiece WP of a plate thickness d (a position Z 1 ), where the velocity Va is set at a high velocity.
- the process interval is the interval from the position Z 1 to a position Z 3 .
- the position Z 3 is the position of the bottom surface of the workpiece WP when the thickness of the plate of the workpiece WP is, for example, less than 2 mm, or a position which is a prescribed dimension (for example, 2 mm) below the top surface of the workpiece WP when the thickness of the plate is 2 mm or greater.
- the velocity Vb in the process interval is set at a low velocity at which the noise and vibration can be controlled.
- the finish interval is the interval from the position Z 3 , to a position Z 4 at a prescribed dimension below a position Z 0 which is the bottom surface of the workpiece WP.
- the velocity Vc in the strike interval is set at a high velocity.
- the return interval is the interval from the lowest position Z 4 to the starting position Z 2 .
- the return velocity Vd in the return interval is set at the maximum velocity.
- Creating the control pattern in the control pattern creation section 27 is generally carried out by a test punching process. Specifically, as shown in FIG. 3, the hydraulic cylinder 9 is activated, the ram 13 descends at a comparatively low velocity V 1 from the top position Zu toward the bottom position Z D . The ram 13 then returns at a comparatively high velocity V 2 from the bottom position Z D toward the top position Zu, and an experimental punching operation is performed.
- the punch 7 descends by means of the ram 13.
- the pressure in the pressurized space of the hydraulic cylinder 9 is increased (shown by the dotted line in the pressure (P), time (t) diagram), so that both the build-up of the pressure P and the maximum punching pressure Pm are detected by the pressure sensor 29.
- control pattern creating section 27 reads the top surface position Z 1 of the workpiece WP from the position of the punch 7 at the pressure P at the time of the pressure build-up as well as reading the maximum punching pressure Pm, and records them.
- the velocity Va of the approach interval shown in FIG. 2 is set at an acceptable high velocity.
- the velocity Vb is selected from the data in the table shown in FIG. 4.
- the data in the table of FIG. 4 indicates the values of velocity for the specified punching force so that levels of the vibration and the noise do not exceed the legal restrictions.
- the data for the punching velocity is drawn up in advance from actual tests. It is classified according to the workpiece material and time period, and is stored in the data storage section 31.
- the position Z 3 where the velocity of the ram is changed to velocity V c is determined; and also the velocity Vc is determined to be an acceptable high velocity.
- the velocity Vd of the return interval is set at the maximum velocity, and the control pattern is created as shown in FIG. 2.
- control pattern created in the control pattern creation section 27 is transmitted to the main control section 25 as previously outlined, and the servo valve 19 is controlled according to the control pattern so that the action of the hydraulic cylinder 9 is controlled.
- the punching velocity Vb is selected according to the test data for the noise and vibration related to the prescribed punching force and punching velocity. Therefore, by the selection of optional punching velocities Vb and the creation of the control pattern it is possible to control the noise and vibration to an acceptable level for the surrounding environment, and an improvement in productivity is effectively provided.
- FIG. 5 shows a second embodiment of the present invention in which each type of control pattern data is prepared in advance, the prescribed control pattern is selected, and the hydraulic cylinder 9 is controlled.
- a control pattern setting section 33 is connected to the servo valve control section 23 in place of the main control section 25 of the previous embodiment.
- An instruction section 35 and a memory section 37 are connected to the control pattern setting section 33.
- the memory section 37 stores various types of control patterns for controlling the vertical motion of the ram 13.
- the memory sections 37 comprises, a punching process control pattern storage section 39, which stores various types of control patterns for the case where the workpiece WP is punched, and a forming process control pattern storage section 41, which stores various types of control patterns for a shaping process such as, for example, a drawing process and the like.
- the various types of punching process control patterns used when a punching process is carried out on the workpiece WP, such as the control pattern of FIG. 2, for example, are stored in the punching process control pattern storage section 39.
- control patterns such as shown in FIG. 6(A) and FIG. 6(B), for example, are stored in the shaping process control pattern storage section 41.
- the control pattern shown in FIG. 6(A) is a suitable control pattern for performing a drawing process on the workpiece WP.
- V E velocity
- the control pattern as shown in FIG. 6(B) should have a low velocity immediately before reaching bottom end.
- a condition occurs where the localized stress of the workpiece WP is dispersed, the mobility of the workpiece WP is stable, and the warp and distortion of the workpiece WP can be suppressed by maintaining the ram 13 and the punch 7 for a desired time interval ⁇ t with a fixed pressure or fixed position at the point where the process is completed.
- either the punching process control pattern storage section 39 or the forming process control pattern storage section 41 is retrieved when the specified punching process or forming process is called by the instruction section 35 which reads the program to find out whether the punching process or forming process is selected therein. Then the specified control pattern is set in the control pattern setting section 33.
- the servo valve 19 is controlled by the set control pattern while the servo valve control section 23 is utilizing the positional and velocity data Z, V which is input from the position and velocity detection section 17, and controls the action of the hydraulic cylinder 9.
- the various types of control patterns stored in the punching process control pattern storage section 39 or the shaping process control pattern storage section 41 are selected, and the action of the hydraulic cylinder is controlled by means of the selected control pattern so that the punching process or forming process is easily performed on the workpiece WP.
- the action of the hydraulic cylinder is controlled by means of the selected control pattern so that the punching process or forming process is easily performed on the workpiece WP.
- it is not necessary to again create a control pattern it is possible to quickly cope with each type of process control.
- the punching operation can be performed by the desired control pattern.
- Noise and vibration are suppressed according to regional and time related regulations, and it is possible to carry out both the punching process and the punching process together with a high quality forming process.
Abstract
Description
Claims (10)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62305945A JPH0724956B2 (en) | 1987-12-04 | 1987-12-04 | Stroke control method for press machine |
JP62305947A JPH0745120B2 (en) | 1987-12-04 | 1987-12-04 | Punch press machine |
JP62-305945 | 1987-12-04 | ||
JP62-305947 | 1987-12-04 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/451,004 Division US5031431A (en) | 1987-12-04 | 1989-12-15 | Method and device for controlling the stroke of a press machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US5027631A true US5027631A (en) | 1991-07-02 |
Family
ID=26564512
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/279,038 Expired - Lifetime US5027631A (en) | 1987-12-04 | 1988-12-02 | Method and device for controlling the stroke of a press machine |
US07/451,004 Expired - Lifetime US5031431A (en) | 1987-12-04 | 1989-12-15 | Method and device for controlling the stroke of a press machine |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/451,004 Expired - Lifetime US5031431A (en) | 1987-12-04 | 1989-12-15 | Method and device for controlling the stroke of a press machine |
Country Status (9)
Country | Link |
---|---|
US (2) | US5027631A (en) |
KR (1) | KR0153515B1 (en) |
AU (2) | AU623104B2 (en) |
CA (1) | CA1335638C (en) |
DE (1) | DE3840395C2 (en) |
FR (1) | FR2624052B1 (en) |
GB (1) | GB2213086B (en) |
IT (1) | IT1227984B (en) |
SE (1) | SE503712C2 (en) |
Cited By (31)
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---|---|---|---|---|
US5113679A (en) * | 1990-06-27 | 1992-05-19 | Burndy Corporation | Apparatus for crimping articles |
US5140834A (en) * | 1989-10-19 | 1992-08-25 | Aida Engineering, Ltd. | Device for automatic adjustment of die height of a press |
US5152162A (en) * | 1990-06-27 | 1992-10-06 | Burndy Corporation | System and method for crimping articles |
US5199290A (en) * | 1989-10-19 | 1993-04-06 | Aida Engineering, Ltd. | Method of automatic adjustment of die height of a press |
US5201204A (en) * | 1992-08-31 | 1993-04-13 | William Hinterman | Press counterbalance system |
US5299478A (en) * | 1992-01-14 | 1994-04-05 | Murata Machinery, Ltd. | Method for controlling punch press noise |
US5564298A (en) * | 1994-11-01 | 1996-10-15 | Aluminum Company Of America | Die tool and press monitor and product quality analysis apparatus and method |
US5661887A (en) * | 1995-04-20 | 1997-09-02 | Emhart Inc. | Blind rivet set verification system and method |
US5666710A (en) * | 1995-04-20 | 1997-09-16 | Emhart Inc. | Blind rivet setting system and method for setting a blind rivet then verifying the correctness of the set |
US5692405A (en) * | 1994-03-31 | 1997-12-02 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus for optimizing press operating condition based on press operating environment and/or physical condition of blank |
US5829289A (en) * | 1995-06-05 | 1998-11-03 | Ford Motor Company | Method of controlling a crimp press for crimping an assembly |
US5913956A (en) * | 1995-06-07 | 1999-06-22 | Capps; David F. | Apparatus and method for progressive fracture of work pieces in mechanical presses |
US5941117A (en) * | 1998-04-30 | 1999-08-24 | Aluminum Company Of America | Die tool thermal control and tooling optimization apparatus and method |
US6145366A (en) * | 1996-11-29 | 2000-11-14 | Komatsu Ltd. | Ram control method and ram control system for press brake |
US6209400B1 (en) | 1997-01-13 | 2001-04-03 | The Minster Machine Company | Portable press vibration severity monitoring system and method |
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US6487885B2 (en) * | 2000-10-30 | 2002-12-03 | Komax Holding Ag | Method and apparatus for producing a crimped connection |
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US6550361B1 (en) | 2000-06-14 | 2003-04-22 | Mead Westvaco Corporation | Platen die cutting monitoring system |
US20030121386A1 (en) * | 2000-06-14 | 2003-07-03 | Davis Denny E. | Die cutter monitoring system |
US20030126963A1 (en) * | 2000-06-14 | 2003-07-10 | Davis Denny E. | Die cutter monitoring system |
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US6874343B1 (en) * | 1999-11-05 | 2005-04-05 | Amada Company, Limited | Press brake and method of controlling bidirectional fluid pump of hydraulic cylinder of press brake |
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US5042336A (en) * | 1989-03-03 | 1991-08-27 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
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US5651282A (en) * | 1995-06-05 | 1997-07-29 | Ford Motor Company | Method of controlling a crimp press for crimping a hose assembly |
US5729462A (en) * | 1995-08-25 | 1998-03-17 | Northrop Grumman Corporation | Method and apparatus for constructing a complex tool surface for use in an age forming process |
US6163734A (en) * | 1996-07-05 | 2000-12-19 | Amada Co Ltd | Punching tool provided with tool identification medium and punch press provided with a tool identification medium reader cross reference to related application |
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EP0243407B1 (en) * | 1985-10-18 | 1991-07-31 | Universal Engineering Development Co. Pty. Ltd. | Improvements to punch presses |
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-
1988
- 1988-11-30 CA CA000584547A patent/CA1335638C/en not_active Expired - Fee Related
- 1988-11-30 DE DE3840395A patent/DE3840395C2/en not_active Expired - Lifetime
- 1988-11-30 GB GB8827978A patent/GB2213086B/en not_active Expired - Lifetime
- 1988-12-01 AU AU26466/88A patent/AU623104B2/en not_active Ceased
- 1988-12-01 IT IT8822821A patent/IT1227984B/en active
- 1988-12-02 SE SE8804378A patent/SE503712C2/en not_active IP Right Cessation
- 1988-12-02 US US07/279,038 patent/US5027631A/en not_active Expired - Lifetime
- 1988-12-02 FR FR8815862A patent/FR2624052B1/en not_active Expired - Lifetime
- 1988-12-03 KR KR1019880016126A patent/KR0153515B1/en not_active IP Right Cessation
-
1989
- 1989-12-15 US US07/451,004 patent/US5031431A/en not_active Expired - Lifetime
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1994
- 1994-07-18 AU AU67544/94A patent/AU669632B2/en not_active Ceased
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Cited By (38)
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US5140834A (en) * | 1989-10-19 | 1992-08-25 | Aida Engineering, Ltd. | Device for automatic adjustment of die height of a press |
US5199290A (en) * | 1989-10-19 | 1993-04-06 | Aida Engineering, Ltd. | Method of automatic adjustment of die height of a press |
US5113679A (en) * | 1990-06-27 | 1992-05-19 | Burndy Corporation | Apparatus for crimping articles |
US5152162A (en) * | 1990-06-27 | 1992-10-06 | Burndy Corporation | System and method for crimping articles |
US5299478A (en) * | 1992-01-14 | 1994-04-05 | Murata Machinery, Ltd. | Method for controlling punch press noise |
US5201204A (en) * | 1992-08-31 | 1993-04-13 | William Hinterman | Press counterbalance system |
US5692405A (en) * | 1994-03-31 | 1997-12-02 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus for optimizing press operating condition based on press operating environment and/or physical condition of blank |
US5564298A (en) * | 1994-11-01 | 1996-10-15 | Aluminum Company Of America | Die tool and press monitor and product quality analysis apparatus and method |
US5666710A (en) * | 1995-04-20 | 1997-09-16 | Emhart Inc. | Blind rivet setting system and method for setting a blind rivet then verifying the correctness of the set |
US5661887A (en) * | 1995-04-20 | 1997-09-02 | Emhart Inc. | Blind rivet set verification system and method |
US5829289A (en) * | 1995-06-05 | 1998-11-03 | Ford Motor Company | Method of controlling a crimp press for crimping an assembly |
US5913956A (en) * | 1995-06-07 | 1999-06-22 | Capps; David F. | Apparatus and method for progressive fracture of work pieces in mechanical presses |
US6145366A (en) * | 1996-11-29 | 2000-11-14 | Komatsu Ltd. | Ram control method and ram control system for press brake |
US6209400B1 (en) | 1997-01-13 | 2001-04-03 | The Minster Machine Company | Portable press vibration severity monitoring system and method |
US5941117A (en) * | 1998-04-30 | 1999-08-24 | Aluminum Company Of America | Die tool thermal control and tooling optimization apparatus and method |
US6874343B1 (en) * | 1999-11-05 | 2005-04-05 | Amada Company, Limited | Press brake and method of controlling bidirectional fluid pump of hydraulic cylinder of press brake |
EP1125682A2 (en) * | 2000-02-16 | 2001-08-22 | Murata Kikai Kabushiki Kaisha | Press machine |
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US6550361B1 (en) | 2000-06-14 | 2003-04-22 | Mead Westvaco Corporation | Platen die cutting monitoring system |
US20030121386A1 (en) * | 2000-06-14 | 2003-07-03 | Davis Denny E. | Die cutter monitoring system |
US20030126963A1 (en) * | 2000-06-14 | 2003-07-10 | Davis Denny E. | Die cutter monitoring system |
US6487885B2 (en) * | 2000-10-30 | 2002-12-03 | Komax Holding Ag | Method and apparatus for producing a crimped connection |
EP1302256A3 (en) * | 2001-10-13 | 2003-06-04 | Bosch Rexroth AG | Control apparatus for a hydraulic cylinder |
EP1302256A2 (en) * | 2001-10-13 | 2003-04-16 | Bosch Rexroth AG | Control apparatus for a hydraulic cylinder |
WO2004005728A1 (en) * | 2002-07-02 | 2004-01-15 | Lillbacka Jetair Oy | Electro hydraulic servo valve |
US6826998B2 (en) | 2002-07-02 | 2004-12-07 | Lillbacka Jetair Oy | Electro Hydraulic servo valve |
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US20070175010A1 (en) * | 2006-01-27 | 2007-08-02 | Pei-Chung Wang | Method for monitoring the installation of blind rivets |
US7313851B2 (en) * | 2006-01-27 | 2008-01-01 | Gm Global Technology Operations, Inc. | Method for monitoring the installation of blind rivets |
US20150246382A1 (en) * | 2012-10-23 | 2015-09-03 | Amada Company, Limited | Device and method for detecting final depth of punch in machine tool |
US9789525B2 (en) * | 2012-10-23 | 2017-10-17 | Amada Company, Limited | Device and method for detecting final depth of punch in machine tool |
CN105715629A (en) * | 2014-07-18 | 2016-06-29 | 江苏省电力公司南通供电公司 | Control method for electric-hydraulic proportional loop system reasonable in structure |
CN105782139A (en) * | 2014-07-18 | 2016-07-20 | 江苏省电力公司南通供电公司 | Electric-hydraulic proportional loop system capable of effectively improving pressing performance |
CN105805061A (en) * | 2014-07-18 | 2016-07-27 | 江苏省电力公司南通供电公司 | Control method of electro-hydraulic proportion loop system with reasonable structure |
US20160376048A1 (en) * | 2015-06-23 | 2016-12-29 | Multivac Sepp Haggenmüller Se & Co. Kg | Thermoform packaging machine with film punch |
US10766655B2 (en) * | 2015-06-23 | 2020-09-08 | Multivac Sepp Haggenmüller Se & Co. Kg | Thermoform packaging machine with film punch |
WO2022063748A1 (en) | 2020-09-22 | 2022-03-31 | Soenen Technology Nv | Improved system for punching holes in a profile with high-throughput and its method |
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Also Published As
Publication number | Publication date |
---|---|
KR890009592A (en) | 1989-08-02 |
SE503712C2 (en) | 1996-08-12 |
US5031431A (en) | 1991-07-16 |
GB2213086A (en) | 1989-08-09 |
GB2213086B (en) | 1992-08-05 |
IT8822821A0 (en) | 1988-12-01 |
SE8804378D0 (en) | 1988-12-02 |
AU2646688A (en) | 1989-06-08 |
GB8827978D0 (en) | 1989-01-05 |
FR2624052B1 (en) | 1995-08-04 |
KR0153515B1 (en) | 1998-11-16 |
FR2624052A1 (en) | 1989-06-09 |
AU669632B2 (en) | 1996-06-13 |
AU623104B2 (en) | 1992-05-07 |
SE8804378L (en) | 1989-06-05 |
DE3840395A1 (en) | 1989-06-15 |
DE3840395C2 (en) | 1998-12-03 |
AU6754494A (en) | 1994-09-22 |
CA1335638C (en) | 1995-05-23 |
IT1227984B (en) | 1991-05-20 |
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